I am already writing a list for mine. Definitely taking my own painkillers (rounds were sparse and they were happy for me to just take my own paracetamol but that may vary by hospital)
Energy drinks/cereal bars/sweets etc (sounds like your healthcare system is a lot better TBF but food was immensely lacking in some wards)
Fibre rich foods. Trust me. :o
Also for when you're home just remembered a product that really helped me so I will try and buy again. You know those gel packs you can freeze and they help with pain? I got some in boots that you put a little cover on and put in your knickers :o really really helped with stitches pain etc.
Pregnancy is so fucking glamourous.